External Heat Source - Viessmann Vitocal 300-G Installation And Service Instructions Manual

Positioning of all terminals
Electric immersion heater EHE
Equipment
Electric immersion See DHW heating,
heater EHE page 53
Installation instructions,
immersion heater EHE

External heat source

!
Please note
Protect the heat pump against
temperatures in excess of 70
°C from the external heat
source.
Install a high limit safety cut-
out (STB) or take further mea-
sures, if required.
Note
The switching contact to demand
heat from the external heat source
(ext. HS) in the heat pump is a zero
volt N/O contact that closes in case
of heat demand.
This contact can be subjected to a
load of 230 V/4(2) A in case of an
external voltage supply. Never route
low voltage via this contact; for that
an on-site relay is required.
Sensor F20 must capture the media
temperature of the external heat
source.
(cont.)
Connection Comments
ID
Alternatively, the external heat
source can be used for DHW heat-
ing; connection on site
6014 Booster heater
Installation sequence
Setting parameters (group)
Ó Yes (DHW)
75